Experimental Study of the Shear Behavior and Shear Strength of Hybrid Fiber-Reinforced SCC Rectangular Beams

Based on the investigation on the workability of macro-mono-steel fibers and macro-hybrid fiber-reinforced self-consolidating concrete, a series of simply supported hybrid fiber-reinforced self-consolidating concrete rectangular beams with four-point vertical load were analyzed by using experiments. Influences of steel fibers and hybrid fibers with various dosages on the shear strength and failure mode of reinforced concrete beams are analyzed. This work finds that hybrid fibers can evidently enhance the shear strength. The failure mode of the beam can be changed from a brittle shear failure into a ductile flexural mechanism due to enough hybrid fibers added. The mechanical behavior of the hybrid fiber-reinforced self-consolidating concrete beam is much better than that of macro-mono-steel fiber-reinforced self-consolidating concrete. Hybrid fibers combined with stirrups show the synergistic response and that is a good way of reinforcement for self-consolidating concrete members. The ultimate shear load of beams with hybrid fibers and/or shear reinforcement can be predicted by the σ-w design method suitably.

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